Abstract
Due to the growing power demands in microgrids (MGs), the necessity for parallel production achieved from distributed generations (DGs) to supply the load required by customers has been increased. Since the DGs have to procure the demand in parallel mode, they are faced with several technical and economic challenges, such as preventing DGs overloading and not losing network stability considering feeder impedance variation. This paper presents a method that upgrades the droop controller based on sliding mode approach, so that DGs are able to prepare a suitable reactive power sharing without error even in more complex MGs. In the proposed strategy, the third-order sliding mode controller significantly reduces the V-Q error and increases the accuracy in adjusting the voltage at the DG output terminals. Various case studies conducted out in this paper validate the truthfulness of the proposed method, considering the stability analysis using Lyapunov function. Finally, by comparing the control parameters of the proposed technique with existing methods, the superiority, simplicity and effectiveness of the 3rd order sliding mode control (SMC) method are determined.
Highlights
The increasing use of distributed generation (DG) units in distribution networks has caused many concerns regarding the units implementation in microgrids (MGs)
The proposed control strategy has been implemented on the MG shown in Figure 6, including two DGs with two local loads and one alternative current (AC) load connected to the point of common coupling (PCC)
The root locus map of the transfer function of proposed control system is presented in Figure 7, which implies on the system stability based on roots movement in terms of ξgc variation in grid-connected operation mode
Summary
The increasing use of distributed generation (DG) units in distribution networks has caused many concerns regarding the units implementation in microgrids (MGs). Among these matters, the reliability and quality of the power supply resources can be mentioned [1]. According to the existing standards in the field of DG operation and control in MGs, if the main network is disconnected, the DG resources must be separated for less than 2 s [2]. Since the DG control systems are designed to provide the ability to inject power in both grid connected and islanding modes, they usually are utilized to make the MG be smart, while the intelligent measurements are installed as shown in Figure 1 [3,4]
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